12.30

#include <iostream>
 
using namespace std;
class Person
{
    int age;
    string &name;
public:
 
    Person(int age,string &name):age(age),name(name){}
    ~Person(){}
    Person(const Person &other):age(other.age),name(other.name){}
    Person &operator=(const Person & other)
    {
            this->age=other.age;
            this->name=other.name;
            return *this;
    }
    Person operator+(Person &other);
    bool operator==(Person &other);
    bool operator&&(Person &other);
    Person operator++();
    Person operator--(int);
    friend ostream &operator<<(ostream &out,Person &s1);
 
};
Person Person::operator+(Person &other)
{
    string *name=new string;
    Person temp(15,*name);
    temp.age=this->age+other.age;
    temp.name=this->name+other.name;
    return temp;
}
bool Person::operator==(Person &other)
{
 
    return this->age==other.age&&this->name==other.name;
}
bool Person::operator&&(Person &other)
{
 
    return this->age&&other.age;
}
Person Person::operator++()
{
    ++(this->age);
    return *this;
}
Person Person::operator--(int)
{
    Person temp(this->age,this->name);
    return temp;
}
ostream &operator<<(ostream &out,Person &s1)
{
    out<<s1.age<<" "<<s1.name<<endl;
   return out;
}
class Stu
{
    double *score;
public:
    Stu(double s):score(new double(s)){}
    ~Stu(){delete score;}
    Stu(const Stu &other):score(new double(*(other.score))){}
    Stu &operator=(const Stu & other)
    {
        *score=*(other.score);
 
            return *this;
    }
};
int main()
{
    string name1="zhangsan";
    string name2="lisi";
    Person s1(18,name1);
    Person s2(s1);
    Person s3(30,name2);
    s3=s2;
    cout<<s3;
 
    return 0;
}